On November 3, 2023 TriSalus Life Sciences Inc., (Nasdaq: TLSI), an oncology company integrating its novel delivery technology with immunotherapy to transform treatment for patients with liver and pancreatic tumors, reported initial positive safety and feasibility data from a Phase 1 trial at the Society of Immunotherapy for Cancer (SITC) (Free SITC Whitepaper) 2023 Annual Meeting (Press release, TriSalus Life Sciences, NOV 3, 2023, View Source [SID1234636933]).
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TriSalus is studying an investigational class C toll-like receptor-9 (TLR9) agonist, SD-101, delivered intravascularly using the Company’s proprietary Pressure-Enabled Drug Delivery (PEDD) method of administration in three Phase 1 trials (periotrial.com). In PERIO-03, SD-101 is delivered via PEDD with the TriSalus Infusion System using a retrograde venous approach, leveraging established interventional radiology access techniques.
The TriSalus Infusion System has an expandable SmartValve and can interface with standard invasive blood pressure transducers for continuous pressure monitoring during infusion of a therapeutic. During infusion, the device blocks retrograde flow and modulates pressure in the vessel, resulting in the perfusion of the venous and capillary network isolated by the device.
Early safety and feasibility data from the PERIO-03 locally advanced pancreatic adenocarcinoma trial revealed that in three patients who received SD-101 via retrograde venous infusion PEDD at the lowest dose level (0.5 mg), there were no serious grade 3/4 adverse events related to treatment. This is a first-in-human experience for use of PEDD and retrograde venous infusion for delivery of an immunologic agent into pancreatic tumors. Immune signals pointed to a decrease in myeloid derived suppressor cells (MDSC) activity in the treated pancreatic tumors, with declines in MDSC associated genes, including arginase-1, nitric oxide synthetase-2, and S100A9 (n=3). Signals associated with T cell activation were also noted in pancreatic tumor biopsy specimens.
"There is a critical need for novel treatments and approaches in locally advanced pancreatic cancer. The PERIO-03 trial is a highly innovative and multidisciplinary approach of delivery of a novel immunotherapy into the pancreas through pancreatic retrograde venous infusion," stated Michael S. Lee, M.D., associate professor of Gastrointestinal (GI) Medical Oncology at The University of Texas MD Anderson Cancer Center. "The treatments have been well tolerated and the translational studies show intriguing changes in immune markers. We are excited to continue enrolling patients in this study."
"These data offer additional validation of our innovative immunotherapy approach for pancreatic tumors. SD-101 was selected based on its mechanism of action, which has the potential to reverse immunosuppression in the pancreas through depletion of MDSC in concert with broad stimulation of immune cells in the tumor microenvironment," said Steven C. Katz, M.D., FACS, Chief Medical Officer at TriSalus. "TriSalus delivery systems, which use the PEDD method, are designed to overcome mechanical barriers to immunotherapy success, which may be underappreciated factors in limiting performance of TLR agonists in liver and pancreas tumors. Pancreatic tumors in particular contain very dense stromal tissue, which may accentuate the mechanical barriers to effective drug delivery in these patients."
Overall, the data emerging from PERIO-03 trials indicate immunologic changes are occurring within the pancreas, with a favorable safety profile. Additionally, pre-clinical data presented by TriSalus at SITC (Free SITC Whitepaper) indicates that SD-101 administered via PEDD can enable both intravenously and subcutaneously administered checkpoint inhibitors.
TriSalus will also present data from its PERIO-01 trial for uveal melanoma liver metastases at a SITC (Free SITC Whitepaper) late breaker session on Saturday, November 4 at 11:25 am PT. All TriSalus presentations from SITC (Free SITC Whitepaper) are available here following their respective sessions.
About Pressure-Enabled Regional Immuno-Oncology (PERIO) clinical trials
The Pressure-Enabled Regional Immuno-Oncology (PERIO) clinical trials are studying an investigational class C toll-like receptor-9 agonist, SD-101, delivered intravascularly by TriSalus’ TriNav Infusion System (TriNav) using the Company’s proprietary Pressure-Enabled Drug Delivery (PEDD) method of administration in three Phase 1 trials.
The PERIO-01 Phase 1 clinical study for uveal melanoma with liver metastases (UMLM), is studying SD-101 delivered via PEDD with TriNav in combination with intravenous checkpoint inhibitors.
The PERIO-02 Phase 1b clinical study for hepatocellular carcinoma and intrahepatic cholangiocarcinoma, is studying SD-101 delivered via PEDD with TriNav in combination with intravenous checkpoint inhibitors.
The PERIO-03 Phase 1 clinical study for locally advanced pancreatic adenocarcinoma, is studying SD-101 delivered via PEDD with TriNav in combination with intravenous checkpoint inhibitors.